<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<span th:text="${param.fileName}"></span>
下载链接：<br>
<a th:href="@{/file_down(fileName=${param.fileName},contentType=${param.contentType})}"
th:text="${param.fileName}"></a>

</body>
</html>